Infant With Pseudohypoparathyroidism Type 1a, Misdiagnosed as Congenital Hypothyroidism

BACKGROUND: Hypothyroidism is a manifestation of multi-hormonal resistance in pseudohypoparathyroidism type Ia (PHP Ia). OBJECTIVE: The aim of this article was to present 9 months old male patient as case of congenital hypothyroidism. CASE REPORT: We describe a 9 months old male diagnosed with congenital hypothyroidism at age 1.5 month, who developed later (at age 5 months) cyanotic attack associated with hypocalcaemia, hyperphosphatemia, and hyperparathyroidism, patient had typical characters of AHO, so the diagnosis of Pseudohypoparathyroidism 1a associated with resistance (TSH) was established. CONCLUSION: Children diagnosed with PHP 1a should be further evaluated for associated resistance endocrinopathies. The literature on pseudohypoparathyroidism is reviewed with special emphasis on the misdiagnosis with congenital hypothyroidism.